91604015 has 16 divisors (see below), whose sum is σ = 111595968. Its totient is φ = 72178176.

The previous prime is 91603969. The next prime is 91604017. The reversal of 91604015 is 51040619.

It is a cyclic number.

It is not a de Polignac number, because 91604015 - 2¹⁰ = 91602991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91604017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110894 + ... + 111716.

It is an arithmetic number, because the mean of its divisors is an integer number (6974748).

Almost surely, 2^91604015 is an apocalyptic number.

91604015 is a deficient number, since it is larger than the sum of its proper divisors (19991953).

91604015 is a wasteful number, since it uses less digits than its factorization.

91604015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 91604015 is about 9570.9986417301. The cubic root of 91604015 is about 450.7871244440.

Adding to 91604015 its sum of digits (26), we get a square (91604041 = 9571²).

The spelling of 91604015 in words is "ninety-one million, six hundred four thousand, fifteen".